Always in position

SELECT * FROM gallery2 WHERE topic_id="1712340" UNION SELECT * FROM gallery2 WHERE topic_id="999312" UNION SELECT * FROM gallery2 WHERE topic_id="1413245" UNION SELECT * FROM gallery2 WHERE topic_id="1401895" UNION SELECT * FROM gallery2 WHERE topic_id="1526536" UNION SELECT * FROM gallery2 WHERE topic_id="262550" UNION SELECT * FROM gallery2 WHERE topic_id="1058058" UNION SELECT * FROM gallery2 WHERE topic_id="178936" UNION SELECT * FROM gallery2 WHERE topic_id="435200" UNION SELECT * FROM gallery2 WHERE topic_id="1219675" UNION SELECT * FROM gallery2 WHERE topic_id="758382" UNION SELECT * FROM gallery2 WHERE topic_id="1649413" UNION SELECT * FROM gallery2 WHERE topic_id="712166" UNION SELECT * FROM gallery2 WHERE topic_id="462084" UNION SELECT * FROM gallery2 WHERE topic_id="368127" UNION SELECT * FROM gallery2 WHERE topic_id="458328"